class Xcodeproj::Workspace

def self.from_s(xml)
  doc = NSXMLDocument.alloc.initWithXMLString(xml, options:0, error:nil)
  projpaths = doc.nodesForXPath("/Workspace/FileRef", error:nil).map do |node|
    node.attributeForName("location").stringValue.sub(/^group:/, '')
  end
  new(*projpaths)
end

def self.new_from_xcworkspace(path)
  begin
    from_s(File.read(File.join(path, 'contents.xcworkspacedata')))
  rescue Errno::ENOENT
    new
  end
end

def <<(projpath)
  @projpaths << projpath
end

def include?(projpath)
  @projpaths.include?(projpath)
end

def initialize(*projpaths)
  @projpaths = projpaths
end

def save_as(path)
  FileUtils.mkdir_p(path)
  File.open(File.join(path, 'contents.xcworkspacedata'), 'w') do |out|
    out << to_s
  end
end

def to_s
  doc = NSXMLDocument.alloc.initWithXMLString(TEMPLATE, options:0, error:nil)
  @projpaths.each do |projpath|
    el = NSXMLNode.elementWithName("FileRef")
    el.addAttribute(NSXMLNode.attributeWithName("location", stringValue:"group:#{projpath}"))
    doc.rootElement.addChild(el)
  end
  NSString.alloc.initWithData(doc.XMLData, encoding:NSUTF8StringEncoding)
end